Kinda confused on EI - please validate my dosing

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Thanks in advance for anyone willing to look through this, it will really help me a lot to get some feedback.

Please help me validate not only my EI dosing strategy, but my logic of how I got there. Each time I sit down to figure out what I should be dosing I admit to getting a bit confused, despite reading gazillions of posts on the same topic.

Here is my step-by-step (so you can see my logic and math) for how I plan to dose my 20gal tank, non-co2 with Excel; about 2wpg.

I want to make stock solutions in 500ml distilled water containers
The cap of my containers is 5ml, and I want to add 5ml of the solution each time I dose
(for convenience, so I always only add one cap)

By trial and error I bumble around with the Gadd calculator for mixing solution in 500ml until the added ppm in 1ml is 1/5 of my new target value – so that 5ml (1 cap full) of the mixed solution will = my new target ppm value for that solution when I dose

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